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migration: handle CANCELLING state in migration_completion()

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The following sequence may cause the VM abort during migration:

1. RUN_STATE_RUNNING,MIGRATION_STATUS_ACTIVE

2. before call migration_completion(), we send migrate_cancel
   QMP command, the state machine is changed to:
     RUN_STATE_RUNNING,MIGRATION_STATUS_CANCELLING

3. call migration_completion(), and the state machine is
   switch to: RUN_STATE_RUNNING,MIGRATION_STATUS_COMPLETED

4. call migration_iteration_finish(), because the migration
   status is COMPLETED, so it will try to set the runstate
   to POSTMIGRATE, but RUNNING-->POSTMIGRATE is an invalid
   transition, so abort().

The migration_completion() should not change the migration state
to COMPLETED if it is already changed to CANCELLING.

Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
Message-Id: <20201105091726.148-1-longpeng2@huawei.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Longpeng(Mike) 2020-11-05 17:17:26 +08:00 committed by Dr. David Alan Gilbert
parent 9e8424088c
commit 6ba11211bd
1 changed files with 2 additions and 0 deletions
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2
migration/migration.c
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@ -3061,6 +3061,8 @@ static void migration_completion(MigrationState *s)
qemu_savevm_state_complete_postcopy(s->to_dst_file);
trace_migration_completion_postcopy_end_after_complete();
} else if (s->state == MIGRATION_STATUS_CANCELLING) {
goto fail;
}
/*